Shadow is an enemy in Wario and Waluigi's Super Adventures, and the star of Shadow's Stupid Adventures. Shadow is a dumb hedgehog who can never seem to come up with a good pun. Sonic created him with a very expensive Shadowball (like a Pokeball, but spawns Shadow rather than a Pokemon). Shadow is Sonic's slave because of all the terrible things he had done to Sonic and his friends over the course of the first season of Wario and Waluigi's Super Adventures. Shadow often escapes Sonic's control though, such as when he escaped and became King Dedede's spy in Wario and Waluigi's Super Adventures, and when he betrayed him in Super Smash Bros Plush.